Persistent post-concussive symptoms from mild traumatic brain injury are a severe issue facing the readiness, retention and quality of life of Department of Defense(DoD) service members and Veterans. The inadequacy of established treatment regimens and evidence-based science in post-concussive symptoms (PCS)/MTBI is forcing a closer look at non-conventional treatments of this condition. Hyperbaric oxygen (HBO2) is a potent intervention with demonstrated efficacy in dive-related injuries, soft tissue healing, and carbon monoxide poisoning.